Cloudflare bug exposed passwords, other sensitive data from websites



For months, a bug in Cloudflare’s content optimization systems exposed sensitive information sent by users to websites that use the company’s content delivery network. The data included passwords, session cookies, authentication tokens and even private messages.

Cloudflare acts as a reverse proxy for millions of websites, including those of major internet services and Fortune 500 companies, for which it provides security and content optimization services behind the scenes. As part of that process, the company’s systems modify HTML pages as they pass through its servers in order to rewrite HTTP links to HTTPS, hide certain content from bots, obfuscate email addresses, enable Accelerated Mobile Pages (AMP) and more.

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